|
| 1 | The total linear energy of colliding bodies before impact must always equal the total energy after impact. |
 | A) | True |
| B) | False |
|
| 2 | The vigor with which a body restores itself to its original shape after deformation is a measure of its elasticity or restitution. |
| A) | True |
| B) | False |
|
| 3 | A coefficient of restitution equal to 0.5 is an indication that the collision is inelastic. |
| A) | True |
| B) | False |
|
| 4 | The units for impulse are equivalent to the units for momentum. |
| A) | True |
| B) | False |
|
| 5 | An object that has linear momentum also has kinetic energy. |
| A) | True |
| B) | False |
|
| 6 | The foot-pound per second is a unit of linear momentum. |
| A) | True |
| B) | False |
|
| 7 | An object bouncing against a floor with perfectly elastic collisions will continue to bounce at the same height. |
| A) | True |
| B) | False |
|
| 8 | Momentum is a scalar quantity. |
| A) | True |
| B) | False |
|
| 9 | Momentum is conserved in all collisions. |
| A) | True |
| B) | False |
|
| 10 | The kilogram-meter per second is a larger unit of momentum than the slug-foot per second. |
| A) | True |
| B) | False |
|
| 11 | Which of the following is not a unit of impulse? |
| A) | Pound-second |
| B) | Newton-second |
| C) | Pound-hour |
| D) | Newton-meter |
|
| 12 | When the velocity of a body is doubled, |
| A) | its kinetic energy is doubled |
| B) | its momentum is doubled |
| C) | its acceleration is doubled |
| D) | its potential energy is doubled |
|
| 13 | A 100-kg astronaut releases 1 g of gas from a special pistol at a speed of 50 m/s.
As a result, he moves in the opposite direction at |
| A) | 5 cm/s |
| B) | 50 cm/s |
| C) | 0.5 cm/s |
| D) | 0.05 cm/s |
|
| 14 | If a car is to gain momentum, it must |
| A) | move rapidly |
| B) | accelerate |
| C) | lose inertia |
| D) | lose weight |
|
| 15 | The face of a golf club exerts an average force of 4000 N while it is in contact with the golf ball. If the impulse is 80 N * s, the time of contact is |
| A) | 0.2 s |
| B) | 0.02 s |
| C) | 2 s |
| D) | 0.002 s |
|
| 16 | In a completely elastic collision, which of the following quantities need not be conserved? |
| A) | Kinetic energy |
| B) | Momentum |
| C) | Mass |
| D) | Potential energy |
|
| 17 | Eight steel balls are suspended from equal heights by threads so that they are all in contact. If two balls are pulled away to the left and released, |
| A) | one ball will leave from the right with twice the speed |
| B) | two balls will leave from the right at approximately the same speed |
| C) | either (a) or (b) might apply |
| D) | neither (a) nor (b) applies |
|
| 18 | A 40-kg cart moving at 3 m/s makes a head-on collision with a 20-kg cart at rest, as illustrated in Fig. 9-2. If the collision is completely inelastic, the speed with which the carts leave the impact is approximately
 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0077158725/294235/fig92.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (21.0K)</a>]]> |
| A) | 2 m/s |
| B) | 6 m/s |
| C) | 20 m/s |
| D) | 0.2 m/s |
|
| 19 | If the collision in Question 18 is completely elastic, the speed of the 20-kg cart after collision will be approximately |
| A) | 6 m/s |
| B) | 3 m/s |
| C) | 4 m/s |
| D) | 2 m/s |
|
| 20 | A 10-g bullet is fired into a 2-kg block of wood suspended from a cord. If the block and bullet rise to a height of 10 cm after impact, the initial velocity of the bullet was approximately |
| A) | 2.8 m/s |
| B) | 281 m/s |
| C) | 235 m/s |
| D) | 28.1 m/s |
|
| 21 | An elastic collision is one in which both and are conserved. |
|
| 22 | is the product of mass and velocity and has the metric units . |
|
| 23 | The negative ratio of the relative velocities after impact to the relative velocities before impact is known as the . |
|
| 24 | The product of the average force acting on a body and the time of action is called and it is equal to the of the body. |
|
| 25 | The coefficient of restitution has a maximum value of for a perfectly impact and a minimum value of for a perfectly impact. |
|
| 26 | If two colliding bodies stick together after impact and move off with the same velocity, the impact is said to be . |
|
| 27 | In USCS, the unit for impulse is , and the unit for momentum is . |
|
| 28 | When a rifle is fired, the of the bullet is the same as the recoil of the rifle. |
|
| 29 | The square root of the ratio of the height to which a ball bounces to its original height is a measure of the . |
|
| 30 | The vigor with which an object restores itself to its original shape after deformation is a measure of its . |